For me its the first or very early LP's of: Allman Brothers - "Allman Joys" "Idyllwild South" Santana - "Santana" 200 g reissue Emerson Lake and Palmer - "Emerson Lake and Palmer" and, Beethoven - "Piano Concerto No. 4 in G Major" Rudolph Serkin/Ozawa/BSO
@uberwaltz, Seems Traffic released different cuts of their first album in mono and stereo under different names. The Wikipedia article is worth a read.
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